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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dae3c268ffd66e172aeb8a9ed4e237fc59b36e92db1d318c9580aeae828687f' 
  AND token = 'QzDIsgvQYg+VeldKlN3YJatrqvUA99Wp1UnlnQ6JqL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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