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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b642a17fd297b5aeab4e45f4151985d2749589f592e0a8e1fe6f25e007def8' 
  AND token = '9RmveGWxmeP3JQboqYofIk+ZmPFIImHOychbFfa0vRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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