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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a8bdb70f389e00ea4e81595364a8850cfe11236737a57ae15fd6c979a50ba3' 
  AND token = 'CWbJAdaNryezvjX9uCw5VzANzspzj10AK8zQPeRmwC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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