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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b04a8237a74978dc6f09235e6bf6a82442367d032af538daea074e77234570' 
  AND token = 'YYUYDxVTKadF3PoEGIaWZe675cSrtMgZtMU4JFtKNaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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