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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5d372120fc848dd1044eef9d6319e5bf7213ad91f21cba68ac0f5ff5fb82e7' 
  AND token = 'RU4/cfU04EeA30WXD/Kj4s8o5nrkaXtEJHVVks0hpd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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