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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ade33f022e60fd93f36a5b8615fd622680c3b7e82c82c7b3fd02dabde2cd60' 
  AND token = 'jPS+gP8mj05EObMYAhtfhmE8e33MiAvzFUvwNjlVodg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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