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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa59d02439a61a9cc3cffe325f8723fa450ae675d2bd7ee197a0a58f172b934a' 
  AND token = '5iuVlsgZypeqdXx70EMSvv01m79H317u8Tf8RTaaQ+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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