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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386209085770bf0e3afc96b13f181f7f25cde46ae76d1fae27573db7c332cbda' 
  AND token = '6S9qIXKsgepVewIzzT0KhQiEOAo2fjM2E/rHmG4rL9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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