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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a4607506eb70171dafa151f8a48f78e79824fd87edcde71b46b970e59128ed' 
  AND token = 'UROatm5hb6//VatnIExGpopuh8RPIPwY9Eg7ASy85q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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