SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5be19d0a26a1f179aa4d1ee03ec24a6dcf9792da1bc9328c36da00aa6da343c' 
  AND token = 'XDJDCJIbGXkKqJgY5hZb7sDYz9xxH3Dgw/mZ83s/7WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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