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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe61f9b3e4cfe1101782a0ce0e8b1e5350cf8e49bfcff64fb4d3d6e91b1aca73' 
  AND token = 'ZeVA6O2nhoV0iRes+uSngc+tw0odwuMKfWUrAdJ5VVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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