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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c8ea581ab66a5943519ead43e76c9339ffa19311e08e43b1276e23959888c4' 
  AND token = '9EOvVRiD5LHMX2E7ene9YHcj0c8wPZ2U6e83oECvl7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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