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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f022a8a6bd509e76c35d499c3536b52cb52ec8867402d074c0176b403398a6' 
  AND token = '68J6tF96w983klFy7y+F12VzBz0he3naIaQjyraSWCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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