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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c683d4f50d20ada923b688d5117dea6ca82dd4a2685cea8b20a080a4e1fab8' 
  AND token = 'OtkObeHJ8hGocYtdUf/MumqJiVKePkeSuuLESjlmvvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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