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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9191041e8c873ec23ab51fe2c08aa3c9875e27d79bedc39e815c294fdfd25071' 
  AND token = 'kKlejOCQUC/deFX0yT1HFPXej/YQPD+99oSmge6ej9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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