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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e9b9fcc3d217d8dc95145b8a6894666610ce0d9180a37078c7f9d41f1a1500' 
  AND token = 'Gca2UFJmsVRdxQNBhXd9LdxVaithq8jhq3/Nc3JUiWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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