SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c26c72e792bc6e6ab169bb41d87808216b013703b94d6bf80aa10891f898f6' 
  AND token = 'JB7HBPUVYHF+DkajG5hZUxOgLK5jhPx3g85OsF3v2MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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