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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9031bea28f4046a57190435adb210c3d5a0f1f09902e7d5a8e4d40f6f45ecdb' 
  AND token = '6ipmR7iDsx/QNlcxGmOHenf8ly3SWl6WtdrLSObhqZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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