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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd6e120a0457bc0ca78b56a3989a7251784715813ea85f10278d35affd8fbbf' 
  AND token = '5qGSEfgGRQyYUMYv+6R0LaCb7mnyAPuyFS0Z8yQfO+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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