SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b93de14366f7b25d36f3d0e77a4bdb610c7d8fedcce8e8747ebcfe1467517a' 
  AND token = 'tnP4FqYjgaw8uplxzlvGychMKEUFbv0ZrTBHk5UL1jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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