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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f82ac1087edd022997caf325193c36217055b5beefee309a949136ce7a57193' 
  AND token = '5fHQQmk9ogaBT4jM8QXzgxS2Yx1pmpJEM2cvnFdR1Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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