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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a669040d1e614a2c332fe6c36742455ffb8e2dc6b7d0461c3e904aff311689db' 
  AND token = 'KP/QDoCZkTky+6gLCHoO1J9Rel4lZXm9BnNTbBmsjRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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