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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e30b545adb0a553250030a4755eb59090d93fe0e8d246f5a8b7bd15c855e028' 
  AND token = 'Bb6CWQB/iv7QfgVnEHV+I6UBean0WhRh1NopdhR9sb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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