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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d540d1f9ed9899db71712bdd7ee474e9a3c966646a45f71ee7fefe0def14d6a' 
  AND token = '9AJMlBl/h4d93ENyGwcIowdrwY/LndrHe0YRN+lOMLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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