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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13667882a4f5eabdd1dfb152a727733bfd73b5ac15d9448727ab92950869ad7' 
  AND token = 'dEotl5xFvrt+Ry4idlEjLCSqzylN/3B8aLZNqzi1jxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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