SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0015bf83acb9d07d9fb4d08876a2a66b084b9625021fe986e7fe31b3f470f3' 
  AND token = 'xYl+UnookYW+OQ/J3Kyq0epO7w+CC3JuOLDkOY9Ijwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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