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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6248152503582de9255138c830a50931a293042257d889de62d4cd8e7ab429' 
  AND token = 'DCSp5WN6hC5fkDuAjD8TIQd+qIHSn5oFwUEN8Qw2t30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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