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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee50da02de272d99ca59113115b78ad7fe5ad3c72f371a7557a5e40631aba4f' 
  AND token = 'kC0tG+JM9ywC0lqjsAJeck3e1FE02D7fizs8wAAUZkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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