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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8371b4e8709a44b60fbd036e87c53eda074379524bc81cbf76be476913d8485' 
  AND token = 'EjPWgCQoNOGX6i82Qr5DIw6gvxscrzgyA0GmsWevb74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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