SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2360e238fd320d9f241386665ea0e6c1f6ba9a87fdca4ecb1d573cdaf2a79e' 
  AND token = 'hy3JhmmSH93jh5z3WgNqQ5+2tO9xB4VRJwSE6V9UMEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00130

JSON explain

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