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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a3bedc2680c5a9db551339d1fa34d81cd54a34ff5ba9d56af6dafd6f2ba1ea' 
  AND token = 'BkN4CwKvJ42bNeDtZmRS9ydHivBMhlKf54l22Aw7bqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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