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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1ba13c6f1ba1d24c6cca5e699657bcc68b0700576bbac2c92641a74d9c5a38' 
  AND token = 'MguCllKk7H6kKqlI7ZPfUKeJ7cgUoBPYLYthbAWSg5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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