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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e37d9ed7774c32f83ca80eafb26cc0950db9a70014c46124ab4fdb9ed47acba' 
  AND token = 'mEsSGH3rVI3Cnd/42VnSxvDCMMTvIwuIn9etvkHiptU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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