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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794dc06c4ad5b46613833dea7251bd353577d480a40ed8d94159693fa1665a8d' 
  AND token = '1G86e1JtNB02bEEyzGpfgZIUbZuEvbl3LjDJeZb5yZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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