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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30390598f37e7e0d224c37de419249bb943762e5a3600b2d9eb3466ae400db60' 
  AND token = 'lAl6332X8NCWhW/hmSyT/D96znGtvkVxYwtefmEnN6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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