SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b895d14c2e2cf4a8c8e478a49fd2f7827b405204e3ff813e89b2f3ac2f821b' 
  AND token = 'KLpd+6EIZ589edBJY5qmPZeIrhox/EKZLgijsMQ7RWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00156

JSON explain

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