SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092ba54c89a0d742f38f7dd8fd90c60d793baf358eedf5f6e265ad7ada42972a' 
  AND token = 'O/qGup8llceBeYRXiZLfdyoBKvo2VJqBiuYuzgkhqM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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