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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb9f9d07d64dedf53a10b7848a08b378e0266c9e09d97ee1ec8ec956f5e061f' 
  AND token = 'AgFMrdLNO7mhM714VC6Vz78u+W24uvRJ6anEbmirJ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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