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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f8202daf56ce5bf273be18ed4e11aae2b9d29a196d89b205768398f9d21c60' 
  AND token = 'DK8z0GrsQF6FQmmFFIL/PL1uRPpUCWL3p+4zXFiKl/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}