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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a5b76637cc9c7fa83d316e2656807997341ed382af221e20d3c2faef0e2038' 
  AND token = 'F45wucQhu5ui5NjCjd2oAxGUy0Z17vlmCPEFUu3fMf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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