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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad7737b6afe4cdd55ed1503dff55d17c82319603c248512d6a6a0e6cfd41eb9' 
  AND token = 'd5QknE9eh5hKmYazfD9iUt0vuDbE5ZM73L1FRdsV5vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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