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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3135fc204311cd453fc8a4db494c81c5625b3086c2fe17554cbe8bb191dec621' 
  AND token = 'jAwAt9lCLj/QfrvxKk7HwqfpyCpVJA/nEx7fHP7s4x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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