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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b1b9588c5f7c99a67e4db7839227eb99a29afde83e0a13699572ca3eb69a8e' 
  AND token = 'l+D3pRCZPsferUWrg2R+l+jPoiUPsGZuX+1pBLMeij0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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