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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ac48e0caca3b7609c14b92d959b0309765def1e1f7c0a15c75b47dd3fdb5f0' 
  AND token = 'rkyEx4xoiqLz2qomqkMjYDfn3l3R4XTWpQH69YlOEx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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