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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1832cb4bc90795974a733ceb5af90bf8266c49a0479888d8cb2444c296faec1' 
  AND token = 'i9I/83d3tmHe1nteq9ipY/EzBumvv8BwvNnRG8078oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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