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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f423414db046944b540018c2c0d107e58cea42d6f51f9f1af9aaee3190bd465d' 
  AND token = '9irp+QcB3zYqSPlAqtBR2T1nN3C/WqQa9MGzD23xgIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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