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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2bf9dc9887e3cb1b6ed936c268a18e8e47848e97537058100157fa31304980' 
  AND token = 'TgjwgvsyDNZoe5CbNXzlwPGXHZ6k7ybz+Y5m8iHc0Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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