SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b5391040a12b2967cf1f9f270669a017f75e54ea42c71184b067d61485188f' 
  AND token = 'YNTBnlkrRrIwZW3QdQ81DhVuiGJeZF7hwpj6V0l8LAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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