SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74cc0580f82435b2d529d4d6e518befab29088912156e30a8b18eb8abfc1cb9' 
  AND token = '/Ed45TVsyEZJFv5gpjKg8Y7wjWJoAqJrRLHOp4iRm+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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