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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370a800f6e3c6e5da9ac711c2517f095a0b34632421a7183936add5b7739f22c' 
  AND token = 'gFf2NtdNJmjJS6vWjWDonJ4CwPvPjwEQi8MVkj6O7/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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