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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f656235a110647033c91c9664cf5694c3796c0b39fa1c140c5c447e9066bd1b' 
  AND token = 'yVf3zLlzO+xHVx8++gaQojEzAhBd6ke8yeDFSCsctdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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