SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379df3b1c7297b98b9c56449d26dee88a59ec49365321ac90a37846d94832a28' 
  AND token = 'eyF6ljzB/0Mj6pVI0feWQm/YiX7buWygE/f2wHzR/CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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