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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c03eb237e20f99c332ee5537b62767764d855ae7c165019d0ee69a30acd138b' 
  AND token = 'uz5Frqfxu6rUCvaL7jq2vgi1MyeumElg17iULYXQJ1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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