Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51618d593a9805ec870af8ed7da2b98b8402cc3eb8fb3815af847a988f0128c' 
  AND token = 'Cc79bfd3updVvo9PbUB4YuspCbTPDxi6THMSZ+6NBzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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