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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bd82bedcb402309f0c6fb13f14bd677e35b41207bcceebe14d938299840532' 
  AND token = 'X6MydV/GH6NOuyROGA92rMqrFD3xaq75xNZXUHHQALU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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