SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22f51214ea37027df3b620ce25941a2884583689c57275762f783f90aa53fd3' 
  AND token = 'GlLS7cIP+gaBZ6ULegxwvi73wqeVHLhL7sJ9jWzoQ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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