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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f47423b53f76b1f013dc692794a76d829d24daa48378811c89d5417bd3380a8' 
  AND token = '13v5a6MayxDNYZdaW83nPwoZPDygxV8fNoATH0iucI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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