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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3693b27483214cb867b4e347e9ed96883a6bc9f6d797578fec1092d63d6b518d' 
  AND token = 'rzUGp81X2agAgVZeO8MJFk6IecL3blX0IHnq3rhkV+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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